Rocker arm structure

Abstract

The utility model belongs to the technical field of mechanical manufacturing and machining, and provides a rocker arm structure which comprises a rocker arm seat, a rocker arm and a rocker arm shaft. One end, far away from the rocker arm seat, of the rocker arm shaft is provided with an external thread and is in threaded connection with a nut; one end of the rocker arm is provided with a mounting hole, the rocker arm rotatably sleeves the rocker arm shaft through the mounting hole, and a bearing is arranged between the rocker arm and the rocker arm shaft. In the rocker arm structure, the rocker arm is rotationally connected with the rocker arm shaft through the bearing, traditional sliding friction is replaced, the rotating resistance of the rocker arm is reduced, and steering is more convenient. The rocker arm seat and the rocker arm shaft are integrally formed through die forging, the size of a forged piece is accurate, the machining allowance is small, and the forged piece has high mechanical strength after thermal refining. And the circlip for the hole is additionally arranged in the mounting hole, and the slotted nut is matched with the cotter pin, so that the bearing can be prevented from falling off, and the stability is improved. The dustproof cover is additionally arranged at the outer end of the mounting hole to prevent dust and muddy water from entering, the sealing performance of parts is better, and the service life of the parts is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical manufacturing processing technical field, concretely relates to a rocker arm structure. BACKGROUND

[0002] In the field of mechanical manufacturing and processing, the double-steering front axle vehicle model of commercial vehicle realizes the steering of double front axles through the swing of the vertical arm and the intermediate transition rocker arm driven by the steering machine and the transmission of the pull rod. Most of the realization of the two-bridge steering function is realized by the power-assisted cylinder and the follower. The power-assisted cylinder is widely used due to its simple structure, large layout space and low cost. The rocker arm structure needs to be transmitted by the rocker arm.

[0003] As shown in Figure 1 The existing rocker arm is sintered with a composite copper sleeve 10 and a body, and the rocker arm seat is a casting. The connection between the rocker arm and the rocker arm seat usually adopts pin shaft connection, that is, the composite copper sleeve 10 is directly rotatably sleeved on the pin shaft 11, so that there is an axial and radial gap between the composite copper sleeve 10 and the pin shaft 11, the sliding friction resistance is large, and the long-term use will cause the phenomenon of loose and fracture, which will affect the steering lightness of the whole vehicle and has certain safety risk. Secondly, the sealing between the composite copper sleeve 10 and the pin shaft 11 is not strict, and the lubricating grease is easy to leak. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, the utility model provides a rocker arm structure which can solve the above problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: a rocker arm structure, comprising a rocker arm seat, a rocker arm, a rocker arm shaft;

[0006] The rocker arm shaft is provided on the rocker arm seat, and the end of the rocker arm shaft away from the rocker arm seat is provided with external threads and a nut is screwed thereon.

[0007] One end of the rocker arm is provided with a mounting hole, the rocker arm is sleeved on the outside of the rocker arm shaft through the mounting hole, a bearing is arranged between the rocker arm and the rocker arm shaft, and the bearing is located between the rocker arm seat and the nut.

[0008] Preferably, the rocker arm shaft and the rocker arm seat are integrally formed.

[0009] Preferably, it further comprises a hole elastic retainer, an annular groove is formed in the inner wall of the mounting hole, the hole elastic retainer is clamped in the annular groove, and the hole elastic retainer is located between the bearing and the nut.

[0010] Preferably, it further comprises a cotter pin, the nut is a slotted nut, a limiting hole is formed through the side wall of the rocker arm shaft, and the cotter pin is used to lock the nut and the rocker arm shaft.

[0011] Preferably, the nut is located in the mounting hole.

[0012] Preferably, the mounting hole is provided with a dust cover away from one end of the rocker arm base.

[0013] Preferably, the mounting hole is provided with a slot on the inner wall away from one end of the rocker arm base, and the dust cover is clamped in the slot.

[0014] Preferably, the bearing is a double-row tapered roller bearing.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] 1. The rocker arm structure provided by the utility model, wherein the rocker arm and the rocker arm shaft are rotatably connected through the bearing, replacing the traditional sliding friction, reducing the rotation resistance of the rocker arm, and making the steering more convenient. The nut can limit the position, and the installation and disassembly are very convenient.

[0017] 2. The rocker arm structure provided by the utility model, wherein the rocker arm base and the rocker arm shaft are integrally formed by die forging, the forged piece is accurate in size, has a small machining allowance, and has high mechanical strength after being quenched and tempered, thereby effectively preventing fatigue fracture of the rocker arm shaft from occurring during long-term use.

[0018] 3. The rocker arm structure provided by the utility model, wherein the elastic retaining ring for the hole, the slotted nut and the split pin are additionally arranged in the mounting hole, so that the bearing can be prevented from falling off, and the stability is improved.

[0019] 4. The rocker arm structure provided by the utility model, wherein the dust cover is additionally arranged at the outer end of the mounting hole, so that dust and mud are prevented from entering, the sealing performance of the parts is better, and the service life of the parts is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a sectional structure schematic view of the rocker arm structure in the prior art;

[0021] Figure 2 It is a sectional structure schematic view of the rocker arm structure provided by the embodiment of the utility model;

[0022] Figure 3 It is a sectional structure schematic view of the rocker arm structure provided by the embodiment of the utility model;

[0023] Figure 4 It is a side structure schematic view of the dust cover of the rocker arm structure and the related part provided by the embodiment of the utility model.

[0024] In the drawings, the components represented by the numbers are listed as follows:

[0025] 1. Rocker arm base;

[0026] 2. rocker arm;

[0027] 3. bearing;

[0028] 4. elastic check ring for hole;

[0029] 5. nut.

[0030] 6. split pin;

[0031] 7. dust cover;

[0032] 8. rocker arm shaft;

[0033] 9. mounting hole;

[0034] 10. composite copper sleeve;

[0035] 11. pin shaft;

[0036] 12. access hole;

[0037] 13. cover plate. DETAILED DESCRIPTION

[0038] In order to make the technical solutions and advantages in the embodiments of the present application more clear and apparent, the exemplary embodiments of the present application are further described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0039] The embodiment provides a rocker arm structure, which comprises a rocker arm base 1, a rocker arm 2 and a rocker arm shaft 8.

[0040] The rocker arm shaft 8 is arranged on the rocker arm base 1, and the rocker arm shaft 8 is provided with external threads at the end away from the rocker arm base 1 and is screwed with a nut 5.

[0041] For example, referring to Figure 2 , the left end of the rocker arm shaft 8 is fixed with the rocker arm base 1, the right end of the rocker arm shaft 8 is provided with external threads, and the right end of the rocker arm shaft 8 is screwed with the nut 5.

[0042] The rocker arm 2 is provided with a mounting hole 9 at one end, the rocker arm 2 is sleeved outside the rocker arm shaft 8 through the mounting hole 9, a bearing 3 is arranged between the rocker arm 2 and the rocker arm shaft 8, and the bearing 3 is located between the rocker arm base 1 and the nut 5.

[0043] For example, referring to Figure 2 , the mounting hole 9 is arranged at the top end of the rocker arm 2 and penetrates left and right, the inner diameter of the mounting hole 9 is greater than the outer diameter of the rocker arm shaft 8, so that the mounting hole 9 can be sleeved outside the rocker arm shaft 8, a bearing 3 is arranged between the mounting hole 9 and the rocker arm shaft 8, so that the rocker arm 2 can stably rotate around the rocker arm shaft 8.

[0044] Based on the above structure, the rocker arm structure provided by the embodiment can replace the traditional sliding friction, so that the rotation resistance of the rocker arm 2 is reduced, and the steering is more convenient. The nut 5 can play a limiting role, and the installation and removal are very convenient.

[0045] The bearing 3 can be a double-row tapered roller bearing. The bearing 3 has a dustproof ring on both sides, is free of lubrication and maintenance, does not need to be separately injected with lubricating grease, and avoids the need for regular injection of lubricating grease in the traditional structure.

[0046] The bearing 3 and the rocker arm 2 are in interference fit, the bearing 3 is assembled after the mounting hole 9 is heated, so that the bearing 3 and the rocker arm 2 can be closely combined. Meanwhile, the rocker arm shaft 8 is partially expanded to form a boss, the boss makes the bearing 3 and the rocker arm shaft 8 can be closely combined, and there is no relative sliding phenomenon, effectively solving the wear problem between the rocker arm 2 and the rocker arm shaft 8.

[0047] On the basis of the above technical solution, in the technical solution provided by the embodiment, the rocker arm shaft 8 and the rocker arm seat 1 are integrally formed.

[0048] For example, referring to Figure 2 , the rocker arm shaft 8 and the rocker arm seat 1 are integrally formed by die forging, the forged piece has accurate dimensions and small machining allowance, is subjected to quenching and tempering treatment, has high mechanical strength, and effectively prevents fatigue fracture of the rocker arm shaft 8 from occurring after long-term use.

[0049] In the technical solution provided by the embodiment, the hole elastic retainer 4 is further included, an annular groove is arranged on the inner wall of the mounting hole 9, the hole elastic retainer 4 is clamped in the annular groove, and the hole elastic retainer 4 is located between the bearing 3 and the nut 5.

[0050] For example, referring to Figure 3 , the annular groove is coaxially arranged on the inner wall of the mounting hole 9, the hole elastic retainer 4 is matched with the annular groove, and the outer end of the hole elastic retainer 4 is embedded in the annular groove, so that the hole elastic retainer 4 can play a limiting role on the bearing 3. The hole elastic retainer 4 has elasticity, is compressed during installation, and is then loosened, so that the hole elastic retainer 4 can be automatically embedded in the annular groove, and the operation is very convenient.

[0051] In the technical solution provided by the embodiment, the split pin 6 is further included, the nut 5 is a slotted nut, a limiting hole is arranged through the side wall of the rocker arm shaft 8, and the split pin 6 is used to lock the nut 5 and the rocker arm shaft 8.

[0052] For example, referring to Figure 3The limiting hole is arranged through the right end side wall of the rocker shaft 8. The nut 5 is a slotted nut, that is, a plurality of open slots are arranged on the side wall of the nut 5. After the nut 5 is tightened, the open slots are aligned with the limiting hole, the split pin 6 is inserted into the open slots and the limiting hole, and the tail part of the split pin 6 is pulled open, so that the relative rotation of the nut 5 and the rocker shaft 8 is prevented. In turn, the bearing 3 is prevented from falling off, and the stability is improved.

[0053] In the technical scheme provided by the embodiment, the nut 5 is located in the mounting hole 9.

[0054] For example, as shown in Figure 3 , the axial length of the mounting hole 9 is longer than the axial length of the rocker shaft 8, so that the mounting hole 9 can wrap the entire rocker shaft 8 on the inside, and the nut 5 is also located in the mounting hole 9. In this way, a protection effect can be achieved, and the nut 5 can be prevented from being affected by the outside world.

[0055] The dust cover 7 is arranged at the end of the mounting hole 9 away from the rocker seat 1.

[0056] Further, the mounting hole 9 is provided with a gap slot on the inner wall of the end away from the rocker seat 1, and the diameter of the gap slot is greater than the diameter of the mounting hole 9. The dust cover 7 is clamped in the gap slot.

[0057] For example, as shown in Figure 3 , the right end of the mounting hole 9 is outwardly expanded to form a gap slot, and the dust cover 7 is in interference fit with the gap slot, that is, the dust cover 7 can be clamped in the gap slot. The dust cover 7 can prevent dust and water from entering the mounting hole 9, so that the sealing performance of the parts is better, and the service life of the parts is prolonged. The dust cover 7 has a certain toughness, and during installation, the dust cover 7 can be directly compressed and clamped into the gap slot, so that the operation is very simple.

[0058] In order to facilitate quick disassembly, as shown in Figure 4 , the dust cover 7 is provided with an inspection hole 12 arranged through the side wall of the dust cover 7, and a cover plate 13 is hingedly connected to the side wall of the dust cover 7, and the cover plate 13 covers the inspection hole 12. A torsional spring is arranged between the cover plate 13 and the dust cover 7, one end of the torsional spring is fixedly connected to the cover plate 13, and the other end of the torsional spring is fixedly connected to the dust cover 7, so that the cover plate 13 can be automatically attached to the dust cover 7.

[0059] When maintenance is needed, the cover plate 13 can be turned over to expose the inspection hole 12, and the specific situation in the mounting hole 9 can be directly observed through the inspection hole 12, so that the staff can quickly maintain. At the same time, the dust cover 7 can be quickly disassembled through the inspection hole 12, for example, the fingers are inserted into the inspection hole 12, the dust cover 7 is buckled, and then pulled out outwardly, so that the operation is simple and convenient. When maintenance is not needed, the cover plate 13 can be automatically attached to the dust cover 7.

[0060] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0061] In addition, the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0063] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A rocker arm structure, characterized in that, Includes rocker arm base (1), rocker arm (2), and rocker arm shaft (8); The rocker arm shaft (8) is mounted on the rocker arm seat (1). The end of the rocker arm shaft (8) away from the rocker arm seat (1) is provided with an external thread and is screwed with a nut (5). The rocker arm (2) has a mounting hole (9) at one end. The rocker arm (2) is sleeved on the outside of the rocker arm shaft (8) through the mounting hole (9). A bearing (3) is provided between the rocker arm (2) and the rocker arm shaft (8). The bearing (3) is located between the rocker arm seat (1) and the nut (5).

2. The rocker arm structure according to claim 1, characterized in that, The rocker arm shaft (8) and the rocker arm seat (1) are integrally formed.

3. The rocker arm structure according to claim 1, characterized in that, It also includes a retaining ring (4) for the hole, an annular groove is provided on the inner wall of the mounting hole (9), the retaining ring (4) for the hole is engaged in the annular groove, and the retaining ring (4) for the hole is located between the bearing (3) and the nut (5).

4. The rocker arm structure according to claim 1, characterized in that, It also includes a cotter pin (6), the nut (5) is a slotted nut, a limiting hole is provided through the side wall of the rocker arm shaft (8), and the cotter pin (6) is used to lock the nut (5) and the rocker arm shaft (8).

5. The rocker arm structure according to claim 1, characterized in that, The nut (5) is located inside the mounting hole (9).

6. The rocker arm structure according to claim 1, characterized in that, The mounting hole (9) is provided with a dust cover (7) at the end away from the rocker arm seat (1).

7. A rocker arm structure according to claim 6, characterized in that, The mounting hole (9) has a clearance groove on the inner wall of the end away from the rocker arm seat (1), and the dust cover (7) is fitted into the clearance groove.

8. The rocker arm structure according to claim 1, characterized in that, The bearing (3) is a double-row tapered roller bearing.

Images